NATURE OF LASER-EMISSION IN NARROW-GAP HG1-XCDXTE

An analysis of the nature of optical transitions in the (Hg, Cd) Te al loy system is presented. Free, bound and localized excitons are the or igin of the main luminescence lines, whereas for very narrow gap mater ial (fitting the 10 mu m region) plasma transitions dominate. Special attention is paid to the luminescence at high excitation levels, where a distinction between plasma transitions and exciton-exciton scatteri ng becomes possible for different samples. The results concerning the gain mechanisms are discussed together with experimental results obtai ned from injection luminescence.